Improvement in treadle-motions



UNITED STATES PATENT OFFICE.

ABRAHAM-L. AKINS, OF GREENSBURG, PENNSYLVANIA.

IM PROVEMENT IN TREADLE-MOTIONS.

Specification forming part of Letters Patent No. 206,914, dated August 13, 1878 application filed July 22, 1878.

To all whom it may concern:

Be it known that I, ABRAHAM L. AKINs, of Greensburg, in the county of Westmoreland and State of Pennsylvania, have invented a new and Improved Treadle-Motion, of which the following is a specification:

In the accompanying drawings, Figure 1 represents a sectional side elevation of my improved treadle-motion; Fig. 2, a top View of the same; and Fig. 3, a detail vertical transverse section on line as m, Fig. 1, showing the connecting of the oscillating arm of the doublecord pulley with the oscillating eccentric-cam arm of the revolving transmitting-wheel.

Similar letters of reference indicate corresponding parts.

This invention has reference to an improved treadle-motion for sewing-machines, circular saws, lathes, and other light machinery, in which the reciprocating motion of a treadle is changed in connection with a spiral spring and intermediate oscillating parts into continuous rotary motion; and the invention consists of the alternating action of a treadle and spring-barrel on a double-cord pulley, to which a fixed arm is applied, that. engages intermittently an oscillating arm with eccentric cam or jaw, the jaw imparting rotary motion to a transmitting-wheel in connection with a flywheel.

Referring to the drawings, A represents the supporting-frame of my improved treadle-rnotion, and B the operating-treadle, whichis hinged at the rear end to the base plate or floor, and connected at the front end by a cord, 0, that passes over a guide groove or pulley, a, of frame to a double-cord pulley,D. PulleyD turns loosely upon a transverse sh aft, E, that revolvesin suitable bearings on frameA.

The cord 0 is attached to one of the grooves of the double pulley D, while a second cord, 0, is attached to the second groove of the pulley, and runs in opposite direction to cord 0 around the same and to the fixed pulley D of a spring-barrel, D to which the end of cord 0 is firmly secured. The downward stroke of the treadle carries thus the pulley D in one direction, while during the upstroke of the treadle the spring-barrel acts on the pulley so as to return it again to its former position. The alternating action of the treadle and spring-barrel imparts thus a rotary reciprocating motion to the double pulley D. This motion is changed to a continuous rotary motion by means of a fixed arm, F, of the pulley D, which arm turns by a sleeve-shaped portion on the-shaft E, and engages the forkshaped end of an eccentric cam or jaw, F, that is pivoted to the lower end of a looselyoscillating arm, F

The eccentric-cam F is preferably faced with rubber or other elastic material, so as to act, when thrown in one direction by the oscillating motion of the arm F, like a jaw on the inner surface of a wheel, Gr, while clearing the same during the opposite or return motion of the arm F. The wheel G is keyed to shaft E, and also provided with a heavy flywheel, G, that is applied to the radially-extended arms of wheel G, and sidewise of the same.

The intermittent action of the eccentric cam or jaw on the wheel Gr produces, in connection with the fly-wheel G, the continuous rotary motion of wheel G, which again transmits rotary motion, by belt-and-pulley connection, to the driving'shaft of a sewing-machine, lathe, saw, or other light machinery. A considerable power may thus be exerted by the treadle-rnotion, while but a small effort is required in working the treadlc.

Having thus described my invention, I claim as new and desire to secure by Letters Patent The combination, in a treadle-motion, of a rotary reciprocating double-cord pulley, operated by a treadle and spiral spring, and having a fixed arm with an oscillating arm carrying a pivoted eccentric cam or jaw, and with a continuously rotating transmitting wheel and fly-wheel, substantially as and for the purpose set forth.

ABRAHAM LAPP AKINS.

Witnesses:

EDGAR (JowAN, H. S. ACKERMAN. 

